CN102680404A - Method and system for pumping detection - Google Patents
Method and system for pumping detection Download PDFInfo
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- CN102680404A CN102680404A CN2012101371194A CN201210137119A CN102680404A CN 102680404 A CN102680404 A CN 102680404A CN 2012101371194 A CN2012101371194 A CN 2012101371194A CN 201210137119 A CN201210137119 A CN 201210137119A CN 102680404 A CN102680404 A CN 102680404A
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Abstract
The invention discloses a method and a system for pumping detection. The measurement method comprises the following steps of: 1, producing output signals of a light pulse sequence with more than two different central wavelengths and different pulse repeating frequencies through a multi-wavelength pulse laser device; 2, processing the output signals of the multi-wavelength pulse laser device; 3, emitting the processed pumping light pulse sequence and a detected light pulse sequence to a device to be detected; and 4, detecting the detected light pulse sequence by a signal detection device to acquire pumping detection signals. According to the method and the system, quick pumping detection and measurement can be performed by using the double-wavelength pulse laser device.
Description
Technical field
The present invention relates to the pump probe technical field, relate in particular to a kind of method and system of pump probe.
Background technology
Time-resolved pumping detecting method is through strong pump light excited sample, and the variation that in sample, has produced state behavior is surveyed this disturbance with weak detection light again and changed.Through information such as the different power that postpone detection light constantly of record under different time delaying sweep, phase place, polarizations, obtain the dynamic process of sample characteristics of for example.
Time-resolved pumping detecting method has important use at aspects such as biological, chemistry, ultrafast dynamics and Nonlinear Mechanism researchs.In the biophysical chemistry reaction, adopt femtosecond pulse to carry out generation and tracking again that pump probe can be observed a ultrafast dynamic process, observe ultrashort reaction transition state of life-span, the carrying out of witness chemical reaction.In nonlinear Mechanism Study; The different non-linear absorption of nonlinear material has different generation condition and response speed with refraction mechanism; Through under different pumping-detection conditions or different pumping-detection sections time delay distinguish these Nonlinear Mechanism, can study the mechanism and the characteristics of various optical nonlinearities.
Usually in the pumping detecting method, pump light and the time delay of surveying between the light can realize that the measuring speed of pump probe is decided by the range scanning rate of optical delay platform through the optical path difference that precision optics postpones platform control two bundle laser processes.The present invention proposes, and adopts a multi-wavelength pulsed laser to export the pulse laser with different frequency, different wave length simultaneously, and obtains having the pump light and detection light of certain frequency difference through the processing of paired pulses laser.Utilize the small difference on the frequency between two frequencies to realize and the similar high precision of sampling oscilloscope principle " equivalent sampling ", and then can obtain the signal of pump probe fast.
Summary of the invention
The invention provides a kind of method and system of pump probe
The invention provides a kind of method of pump probe, comprising:
Step 1, multi-wavelength pulsed laser produce the output signal with light pulse sequence of different centre wavelengths and different pulse repetition more than two;
Step 2 is handled the output signal of multi-wavelength pulsed laser;
Step 3, pump light pulse train and detecting optical pulses sequence after the processing incide on the device under test;
Step 4, signal detection device detects the detecting optical pulses sequence, obtains the pump probe signal.
In one example; In the step 2; The output signal of multi-wavelength pulsed laser handled comprise that output signal or its part are carried out power amplification, power control, pulse waveform conversion, Polarization Control, light beam carries out the optical processing of spectrum transform along separate routes or through nonlinear optical process, to form pump light pulse train and detecting optical pulses sequence.
In one example; In the step 2; The output signal of multi-wavelength pulsed laser handled comprise the output signal of multi-wavelength pulsed laser is divided into pump light pulse train and detecting optical pulses sequence according to the difference of centre wavelength, the centre wavelength of pump light pulse train is the pump light wavelength, and the repetition frequency of pump light pulse train is a pump frequency; The centre wavelength of detecting optical pulses sequence is detection optical wavelength, and the repetition frequency of detecting optical pulses sequence is a look-in frequency.
In one example, in the step 3, pump light pulse train and detecting optical pulses sequence conllinear or non-colinear incide on the device under test.
In one example, it is characterized in that in the step 4, signal detection device detects the detecting optical pulses sequence, the time step conversion relation between detection signal that obtains and the pump probe signal is Δ T=Δ τ Δ f/f
p, wherein Δ f is repetition frequency poor of pump light pulse train and detecting optical pulses sequence, f
pBe the repetition frequency of detecting optical pulses sequence, Δ τ is the time step of detection signal, and Δ T is the time step of pump probe signal.
The invention provides a kind of system of pump probe, comprising:
The multi-wavelength pulsed laser produces two or more output signals with light pulse sequence of different centre wavelengths and different repetition frequencys;
The burst process device is used for producing pump light pulse train and detecting optical pulses sequence by the output signal of multi-wavelength pulsed laser;
Device under test need carry out the device that pump probe is measured;
Signal detection device is used to detect the detecting optical pulses sequence, obtains the pump probe signal.
In one example, described burst process device comprises power amplifier, pmd controller spare, Polarization Control device, device for non-linear optical.
In one example; Described burst process device also comprises light-splitting device; Pump light pulse train and detecting optical pulses sequence are separated, make pump light pulse train and detecting optical pulses sequence respectively after treatment, incide on the device under test with conllinear or non-colinear mode.
In one example, described signal detection device comprises PIN detecting device, APD detecting device, photomultiplier or balanced detector.
In one example, described signal detection device also comprises optical filter, BPF. or the wavelength division multiplexer with filter function and the polarization beam splitter prism with analyzing function, polaroid.
In one example, described multi-wavelength pulsed laser is multi-wavelength active mode laser instrument, multi-wavelength laser with active-passive lock mould or multi-wavelength mixing mode-locked laser.
The present invention can utilize the multi-wavelength pulsed laser to carry out pump probe measurement fast.The light pulse sequence of the different wave length that multiple-wavelength laser produces has different pulse repeating frequency, is not the integral multiple relation between the different pulse repeating frequency.
Description of drawings
Come the present invention is done further explain below in conjunction with accompanying drawing, wherein:
Fig. 1 is the block diagram of a kind of pump probe system;
Fig. 2 is the instance graph of first kind of pump probe system;
Fig. 3 is the instance graph of second kind of pump probe system;
Fig. 4 is the instance graph of the third pump probe system;
Fig. 5 is the instance graph of the 4th kind of pump probe system;
Embodiment
Below the dual wavelength mode-locked laser that uses in each instance adopt Er-doped fiber as gain media, regulate the shape of interacvity gain spectrum through the loss in the control chamber, be implemented in 1530 with the double-wavelength pulse laser output of 1560nm.Owing to the chromatic dispersion that devices such as optical fiber in optical fiber cavity exist, the group velocity of two wavelength is different, so the repetition frequency of two wavelength pulse outputs is also different.If the repetition frequency of 1530nm wavelength pulse sequence is f
1, and the repetition frequency of 1560m wavelength pulse sequence is f
p, difference on the frequency is Δ f.
Instance one
Adopt the system diagram of pump probe system of above-mentioned double-wavelength pulse laser instrument as shown in Figure 2.The different light pulse of two repetition frequencys of double-wavelength pulse laser instrument output through optical filter be divided into 1530 with the pulse laser output of 1560nm.The pulsed light of 1560nm is carried out power amplification and pulse compression through image intensifer, and as pump light, wavelength is the pulsed light process power controller spare of 1530nm, as surveying light.Pump light and detection light are combined into one road light through optical fiber coupling device, incide on the device under test, and the output light signal leaches detection light through optical filter, after the process photoelectric detector carries out opto-electronic conversion, use oscilloscope measurement.And with the time step conversion Δ f/f of this signal
1Doubly, obtain the pump probe signal.
Instance two
Adopt the system diagram of pump probe system of above-mentioned double-wavelength pulse laser instrument as shown in Figure 3.The different light pulse collinear incident of two repetition frequencys of double-wavelength pulse laser instrument output is to device under test, and wherein the pulse of 1560nm is as pump light, and wavelength is that the pulsed light of 1530nm is as surveying light.Through optical filter, leach detection light through the light signal after the device under test, after the process photoelectric detector carries out opto-electronic conversion, use oscilloscope measurement.And with the time step conversion Δ f/f of this signal
1Doubly obtain the pump probe signal.
Instance three
Adopt the system diagram of pump probe system of above-mentioned double-wavelength pulse laser instrument as shown in Figure 4.The different light pulse of two repetition frequencys of double-wavelength pulse laser instrument output through beam splitter be divided into 1530 with the pulse laser output of 1560nm.The pulsed light of 1560nm is carried out power amplification and pulse compression through image intensifer, and as pump light, wavelength is that the pulsed light of 1530nm carries out power amplification and pulse compression through image intensifer, and the light of the 765nm after the process bbo crystal frequency multiplication is as surveying light.On device under test, photoelectric detector detects surveys light, and measures with oscillograph through lens focus for non-colinear pump light and detection light.Time step conversion Δ f/f with measuring-signal
1Doubly, obtain the pump probe signal.
Instance four
Adopt the system diagram of pump probe system of above-mentioned double-wavelength pulse laser instrument as shown in Figure 5.The different light pulse of two repetition frequencys of double-wavelength pulse laser instrument output through beam splitter be divided into 1530 with the pulse laser output of 1560nm.The pulsed light of 1530nm is carried out power amplification and pulse compression through image intensifer, and through becoming the light of 765nm after the bbo crystal frequency multiplication, through becoming the pump light of horizontal polarization behind the polarization splitting prism.Wavelength is that the pulsed light of 1560nm carries out power amplification and pulse compression through image intensifer, and through becoming the light of 780nm after the bbo crystal frequency multiplication, through the polarizer, becomes the detection light with 45 degree linear polarization state.Non-colinear pump light with survey light through lens focus on device under test, survey light through the polarization direction analyzer vertical with the polarizer after by the photoelectric detector detection, measure with oscillograph, with the time step conversion Δ f/f of measuring-signal
2Doubly, obtain the pump probe signal.
The above is merely preferred implementation of the present invention, but protection domain of the present invention is not limited thereto.Any those skilled in the art all can carry out suitable change or variation to it in technical scope disclosed by the invention, and this change or variation all should be encompassed within protection scope of the present invention.
Claims (10)
1. the method for a pump probe is characterized in that, comprising:
Step 1, multi-wavelength pulsed laser produce the output signal with light pulse sequence of different centre wavelengths and different pulse repetition more than two;
Step 2 is handled the output signal of multi-wavelength pulsed laser;
Step 3, pump light pulse train and detecting optical pulses sequence after the processing incide on the device under test;
Step 4, signal detection device detects the detecting optical pulses sequence, obtains the pump probe signal.
2. the method for pump probe as claimed in claim 1; It is characterized in that; In the step 2; The output signal of multi-wavelength pulsed laser handled comprise that output signal or its part are carried out power amplification, power control, pulse waveform conversion, Polarization Control, light beam carries out the optical processing of spectrum transform along separate routes or through nonlinear optical process, to form pump light pulse train and detecting optical pulses sequence.
3. the method for pump probe as claimed in claim 1; It is characterized in that; In the step 2; The output signal of multi-wavelength pulsed laser handled comprise the output signal of multi-wavelength pulsed laser is divided into pump light pulse train and detecting optical pulses sequence according to the difference of centre wavelength, the centre wavelength of pump light pulse train is the pump light wavelength, and the repetition frequency of pump light pulse train is a pump frequency; The centre wavelength of detecting optical pulses sequence is detection optical wavelength, and the repetition frequency of detecting optical pulses sequence is a look-in frequency.
4. the method for pump probe as claimed in claim 1 is characterized in that, in the step 3, pump light pulse train and detecting optical pulses sequence conllinear or non-colinear incide on the device under test.
5. the method for pump probe as claimed in claim 1 is characterized in that, in the step 4, signal detection device detects the detecting optical pulses sequence, and the time step conversion relation between detection signal that obtains and the pump probe signal is Δ T=Δ τ Δ f/f
p, wherein Δ f is repetition frequency poor of pump light pulse train and detecting optical pulses sequence, f
pBe the repetition frequency of detecting optical pulses sequence, Δ τ is the time step of detection signal, and Δ T is the time step of pump probe signal.
6. the system of a pump probe is characterized in that, comprising:
The multi-wavelength pulsed laser produces two or more output signals with light pulse sequence of different centre wavelengths and different repetition frequencys;
The burst process device is used for producing pump light pulse train and detecting optical pulses sequence by the output signal of multi-wavelength pulsed laser;
Device under test need carry out the device that pump probe is measured;
Signal detection device is used to detect the detecting optical pulses sequence, obtains the pump probe signal.
7. the system of pump probe as claimed in claim 6 is characterized in that, described burst process device comprises power amplifier, pmd controller spare, Polarization Control device, device for non-linear optical.
8. the system of pump probe as claimed in claim 6; It is characterized in that; Described burst process device also comprises light-splitting device; Pump light pulse train and detecting optical pulses sequence are separated, make pump light pulse train and detecting optical pulses sequence respectively after treatment, incide on the device under test with conllinear or non-colinear mode.
9. the system of pump probe as claimed in claim 6 is characterized in that, described signal detection device comprises PIN detecting device, APD detecting device, photomultiplier or balanced detector.
10. the system of pump probe as claimed in claim 6 is characterized in that, described signal detection device also comprises optical filter, BPF. or the wavelength division multiplexer with filter function and the polarization beam splitter prism with analyzing function, polaroid.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101371194A CN102680404A (en) | 2012-05-04 | 2012-05-04 | Method and system for pumping detection |
| PCT/CN2013/072093 WO2013127370A1 (en) | 2012-03-02 | 2013-03-01 | Method and system for measuring optical asynchronous sampled signal |
| US14/382,333 US9250128B2 (en) | 2012-03-02 | 2013-03-01 | Method and apparatus for optical asynchronous sampling signal measurements |
| US14/475,434 US9273994B2 (en) | 2012-03-02 | 2014-09-02 | Method and apparatus for optical asynchronous sampling signal measurements |
| US14/968,237 US9885614B2 (en) | 2012-03-02 | 2015-12-14 | Method and apparatus for multifrequency optical comb generation |
| US14/968,289 US9863815B2 (en) | 2012-03-02 | 2015-12-14 | Method and apparatus for multifrequency optical comb generation |
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| CN2012101371194A CN102680404A (en) | 2012-05-04 | 2012-05-04 | Method and system for pumping detection |
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| WO2013127370A1 (en) * | 2012-03-02 | 2013-09-06 | 北京航空航天大学 | Method and system for measuring optical asynchronous sampled signal |
| CN103712949A (en) * | 2013-12-26 | 2014-04-09 | 无锡利弗莫尔仪器有限公司 | Photo-thermal absorption spectrum technology-based cooking oil detection method and photo-thermal absorption spectrum technology-based cooling oil detection device |
| CN107101946A (en) * | 2017-06-28 | 2017-08-29 | 哈尔滨工业大学 | The homologous laser pump (ing) detection device of light delay with probe optical pulse compress technique |
| CN111352144A (en) * | 2020-03-27 | 2020-06-30 | 中国科学院西安光学精密机械研究所 | X-ray ultrafast detection device and method |
| CN112255173A (en) * | 2020-09-24 | 2021-01-22 | 北京大学 | All-optical regulation and control method and device for graphene nonlinear optical effect |
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| WO2013127370A1 (en) * | 2012-03-02 | 2013-09-06 | 北京航空航天大学 | Method and system for measuring optical asynchronous sampled signal |
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| CN103712949A (en) * | 2013-12-26 | 2014-04-09 | 无锡利弗莫尔仪器有限公司 | Photo-thermal absorption spectrum technology-based cooking oil detection method and photo-thermal absorption spectrum technology-based cooling oil detection device |
| CN107101946A (en) * | 2017-06-28 | 2017-08-29 | 哈尔滨工业大学 | The homologous laser pump (ing) detection device of light delay with probe optical pulse compress technique |
| CN107101946B (en) * | 2017-06-28 | 2019-11-15 | 哈尔滨工业大学 | The homologous laser pump (ing) detection device of light delay with probe optical pulse compress technique |
| CN111352144A (en) * | 2020-03-27 | 2020-06-30 | 中国科学院西安光学精密机械研究所 | X-ray ultrafast detection device and method |
| CN112255173A (en) * | 2020-09-24 | 2021-01-22 | 北京大学 | All-optical regulation and control method and device for graphene nonlinear optical effect |
| CN112255173B (en) * | 2020-09-24 | 2022-02-01 | 北京大学 | All-optical regulation and control method and device for graphene nonlinear optical effect |
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Application publication date: 20120919 |